Energy available at the impeller to the energy supplied to the pump by the prime mover
Actual workdone by the pump to the energy supplied to the pump by the prime mover
Energy supplied to the pump to the energy available at the impeller
Manometric head to the energy supplied by the impeller per kN of water
B. Actual workdone by the pump to the energy supplied to the pump by the prime mover
(W/p) × (A/a)
(p/W) × (a/A)
(W/p) × (a/A)
(p/W) × (A/a)
39.2 %
48.8 %
84.8 %
88.4 %
Centrifugal pump
Mixed flow pump
Axial flow pump
Any one of the above
Installing the turbine below the tail race level
Using stainless steel runner of the turbine
Providing highly polished blades to the runner
All of the above
They have slow speeds
They are suitable even for low water heads
They give constant efficiency, even if the discharge is not constant
All of the above
Have identical velocities
Are equal in size and shape
Are identical in shape, but differ only in size
Have identical forces
Centrifugal pump
Reciprocating pump
Jet pump
Air lift pump
Straight
Bent forward
Bent backward
Radial
Two jets
Two runners
Four jets
Four runners
4
6
8
12
To run the turbine full
To prevent air to enter the turbine
To increase the head of water by an amount equal to the height of the runner outlet above the tail race
To transport water to downstream
Centrifugal
Axial flow
Mixed flow
Reciprocating
(w Hm) / (Q × ηo)
(w Hm Q) / ηo
(w Q) / (Hm × ηo)
(w Q ηo) / Hm
0.15 to 0.3
0.4 to 0.5
0.6 to 0.9
1 to 1.5
Low velocity
High velocity
Low pressure
High pressure
Decreases
Increases
Remain same
None of these
Directly as the air or gas density
Inversely as square root of density
Inversely as density
As square of density
Directly proportional to H1/2
Inversely proportional to H1/2
Directly proportional to H3/2
Inversely proportional to H3/2
The reaction turbines are used for low head and high discharge.
The angle of taper on draft tube is less than 8°.
An impulse turbine is generally fitted slightly above the tail race.
A Francis turbine is an impulse turbine.
Kept fully closed
Kept fully open
Irrespective of any position
Kept 50% open
Q/√H
Q/H
Q/H3/2
Q/H²
Propeller turbine
Francis turbine
Impulse turbine
Any one of the above
Smoothen the flow
Reduce suction head
Increase delivery head
Reduce acceleration head
P/ √H
P/ H
P/ H3/2
P/ H²
N√P / H3/2
N√P / H²
N√P / H5/4
N√P / H3
At the top
At the bottom
At the canter
From sides
Greater than 15°
Greater than 8°
Greater than 5°
Less than 8°
Kinetic head
Velocity head
Manometric head
Static head
Girad turbine
Turgo turbine
Pelton wheel
Kaplan turbine
Low head of water
High head of water
Medium head of water
High discharge